Background The subclinical pathophysiology of proliferative lupus nephritis (PLN) has not been fully elucidated. Myeloperoxidase anti-neutrophil cytoplasmic antibody (MPO-ANCA) is associated with PLN, but prediagnostic levels have not been reported. Methods We performed a retrospective case-control Department of Defense Serum Repository (DoDSR) study comparing MPO-ANCA levels in longitudinal ...

a. Serum anti-neutrophil cytoplasmic antibody (ANCA) measurement should not be used alone in the initial diagnosis of ANCA-associated vasculitis (AAV) but should be used in combination with the gold standard of tissue diagnosis. (Level 1 evidence) b. Measurement of ANCA by both ELISA and indirect immunofluorescence (IIF) in combination ensures optimal test sensitivity and specificity. (Level I ...

Cumulating evidences suggested an important role of sphingosine-1-phosphate (S1P) and its receptors in regulating endothelial barrier integrity. Our previous study revealed that the circulating S1P levels and renal expression of S1PRs correlated with disease activity and renal damage in patients with antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV). This study investigated...

Objective: To describe the clinical, serological characteristics, and renal histology in Mexican patients with antineutrophil cytoplasmic antibody (ANCA) associated vasculitis (AAV). Methods: Forty patients with diagnosis of AAV and renal biopsy, followed at a tertiary care center in Mexico City from 2002-2012 were retrospectively studied. Demographics, comorbidities, clinical, laboratory varia...

The reports of a newborn who developed glomerulonephritis and pulmonary hemorrhage after transplacental transfer of anti-neutrophil cytoplasmic antibody (ANCA) IgG with specificity for myeloperoxidase (MPO) is compelling clinical evidence that ANCA are pathogenic. In vitro studies indicate that ANCA activate cytokine-primed neutrophils and monocytes through both direct Fab'2 binding and Fc rece...

Objective: Granulomatous polyangiitis patients generally have ANCA targeting Proteinase 3 (PR3), while microscopic polyangiitis and eosinophilic granulomatous polyangiitis patients generally have ANCA targeting myeloperoxidase (MPO). Patients positive for both PR3-ANCA and MPO-ANCA are uncommon and any diagnostic value of this situation has not been well described. The aim of this study was to ...

To determine the prevalence of antineutrophil cytoplasmic antibodies (ANCA) in patients with infective endocarditis (IE) in internal medicine; and to compare clinical and biochemical features and outcome between patients exhibiting IE with and without ANCA.Fifty consecutive patients with IE underwent ANCA testing. The medical records of these patients were reviewed.Of the 50 patients with IE, 1...

Antineutrophil cytoplasmic antibodies (ANCA) are well known to be associated with several types of vasculitis, including pauci-immune crescentic glomerulonephritis, a form of rapid progressive glomerular nephritis (RPGN). ANCA vasculitis has also been reported after administration of propylthiouracil, hydralazine, cocaine (adulterated with levimasole), allopurinol, penicillamine and few other d...

Antineutrophil cytoplasmic antibody (ANCA) tests are used to diagnose and monitor inflammatory activity in Wegener granulomatosis, microscopic polyangiitis and its renal-limited variant (pauci-immune crescentic glomerulonephritis), and Churg-Strauss syndrome. The International Consensus Statement on testing and reporting of ANCA states that ANCA are demonstrated most readily in these conditions...

BACKGROUND AND AIMS The only recognized biomarker for primary sclerosing cholangitis (PSC) is atypical anti-neutrophil cytoplasmic antibodies (aANCA), which, in addition to having low sensitivity and specificity, is an indirect immunofluorescence (IIF) test lacking the advantages of high throughput and objectivity. Recent reports have shown that antibodies to proteinase-3 (PR3-ANCA) might add d...